The Rotel RB 1070 does a fine job with the M80s. I had it hooked to my M80s for a while as I was waiting for the RB 1080 to come into stock. Nad is pretty well know to handle 4 ohm loads as well. I wouldn't be concerned with either pushing the M80s.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud